303 lines
8.5 KiB
C
303 lines
8.5 KiB
C
/*
|
|
* Connection state tracking for netfilter. This is separated from,
|
|
* but required by, the (future) NAT layer; it can also be used by an iptables
|
|
* extension.
|
|
*
|
|
* 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
|
|
* - generalize L3 protocol dependent part.
|
|
*
|
|
* Derived from include/linux/netfiter_ipv4/ip_conntrack.h
|
|
*/
|
|
|
|
#ifndef _NF_CONNTRACK_H
|
|
#define _NF_CONNTRACK_H
|
|
|
|
#include <linux/netfilter/nf_conntrack_common.h>
|
|
|
|
#include <linux/bitops.h>
|
|
#include <linux/compiler.h>
|
|
#include <linux/atomic.h>
|
|
|
|
#include <linux/netfilter/nf_conntrack_tcp.h>
|
|
#include <linux/netfilter/nf_conntrack_dccp.h>
|
|
#include <linux/netfilter/nf_conntrack_sctp.h>
|
|
#include <linux/netfilter/nf_conntrack_proto_gre.h>
|
|
#include <net/netfilter/ipv6/nf_conntrack_icmpv6.h>
|
|
|
|
#include <net/netfilter/nf_conntrack_tuple.h>
|
|
|
|
/* per conntrack: protocol private data */
|
|
union nf_conntrack_proto {
|
|
/* insert conntrack proto private data here */
|
|
struct nf_ct_dccp dccp;
|
|
struct ip_ct_sctp sctp;
|
|
struct ip_ct_tcp tcp;
|
|
struct nf_ct_gre gre;
|
|
};
|
|
|
|
union nf_conntrack_expect_proto {
|
|
/* insert expect proto private data here */
|
|
};
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/timer.h>
|
|
|
|
#ifdef CONFIG_NETFILTER_DEBUG
|
|
#define NF_CT_ASSERT(x) WARN_ON(!(x))
|
|
#else
|
|
#define NF_CT_ASSERT(x)
|
|
#endif
|
|
|
|
struct nf_conntrack_helper;
|
|
|
|
/* Must be kept in sync with the classes defined by helpers */
|
|
#define NF_CT_MAX_EXPECT_CLASSES 4
|
|
|
|
/* nf_conn feature for connections that have a helper */
|
|
struct nf_conn_help {
|
|
/* Helper. if any */
|
|
struct nf_conntrack_helper __rcu *helper;
|
|
|
|
struct hlist_head expectations;
|
|
|
|
/* Current number of expected connections */
|
|
u8 expecting[NF_CT_MAX_EXPECT_CLASSES];
|
|
|
|
/* private helper information. */
|
|
char data[];
|
|
};
|
|
|
|
#include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
|
|
#include <net/netfilter/ipv6/nf_conntrack_ipv6.h>
|
|
|
|
struct nf_conn {
|
|
/* Usage count in here is 1 for hash table/destruct timer, 1 per skb,
|
|
* plus 1 for any connection(s) we are `master' for
|
|
*
|
|
* Hint, SKB address this struct and refcnt via skb->nfct and
|
|
* helpers nf_conntrack_get() and nf_conntrack_put().
|
|
* Helper nf_ct_put() equals nf_conntrack_put() by dec refcnt,
|
|
* beware nf_ct_get() is different and don't inc refcnt.
|
|
*/
|
|
struct nf_conntrack ct_general;
|
|
|
|
spinlock_t lock;
|
|
u16 cpu;
|
|
|
|
/* XXX should I move this to the tail ? - Y.K */
|
|
/* These are my tuples; original and reply */
|
|
struct nf_conntrack_tuple_hash tuplehash[IP_CT_DIR_MAX];
|
|
|
|
/* Have we seen traffic both ways yet? (bitset) */
|
|
unsigned long status;
|
|
|
|
/* Timer function; drops refcnt when it goes off. */
|
|
struct timer_list timeout;
|
|
|
|
possible_net_t ct_net;
|
|
|
|
/* all members below initialized via memset */
|
|
u8 __nfct_init_offset[0];
|
|
|
|
/* If we were expected by an expectation, this will be it */
|
|
struct nf_conn *master;
|
|
|
|
#if defined(CONFIG_NF_CONNTRACK_MARK)
|
|
u_int32_t mark;
|
|
#endif
|
|
|
|
#ifdef CONFIG_NF_CONNTRACK_SECMARK
|
|
u_int32_t secmark;
|
|
#endif
|
|
|
|
/* Extensions */
|
|
struct nf_ct_ext *ext;
|
|
|
|
/* Storage reserved for other modules, must be the last member */
|
|
union nf_conntrack_proto proto;
|
|
};
|
|
|
|
static inline struct nf_conn *
|
|
nf_ct_tuplehash_to_ctrack(const struct nf_conntrack_tuple_hash *hash)
|
|
{
|
|
return container_of(hash, struct nf_conn,
|
|
tuplehash[hash->tuple.dst.dir]);
|
|
}
|
|
|
|
static inline u_int16_t nf_ct_l3num(const struct nf_conn *ct)
|
|
{
|
|
return ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
|
|
}
|
|
|
|
static inline u_int8_t nf_ct_protonum(const struct nf_conn *ct)
|
|
{
|
|
return ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum;
|
|
}
|
|
|
|
#define nf_ct_tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
|
|
|
|
/* get master conntrack via master expectation */
|
|
#define master_ct(conntr) (conntr->master)
|
|
|
|
extern struct net init_net;
|
|
|
|
static inline struct net *nf_ct_net(const struct nf_conn *ct)
|
|
{
|
|
return read_pnet(&ct->ct_net);
|
|
}
|
|
|
|
/* Alter reply tuple (maybe alter helper). */
|
|
void nf_conntrack_alter_reply(struct nf_conn *ct,
|
|
const struct nf_conntrack_tuple *newreply);
|
|
|
|
/* Is this tuple taken? (ignoring any belonging to the given
|
|
conntrack). */
|
|
int nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple,
|
|
const struct nf_conn *ignored_conntrack);
|
|
|
|
/* Return conntrack_info and tuple hash for given skb. */
|
|
static inline struct nf_conn *
|
|
nf_ct_get(const struct sk_buff *skb, enum ip_conntrack_info *ctinfo)
|
|
{
|
|
*ctinfo = skb->nfctinfo;
|
|
return (struct nf_conn *)skb->nfct;
|
|
}
|
|
|
|
/* decrement reference count on a conntrack */
|
|
static inline void nf_ct_put(struct nf_conn *ct)
|
|
{
|
|
NF_CT_ASSERT(ct);
|
|
nf_conntrack_put(&ct->ct_general);
|
|
}
|
|
|
|
/* Protocol module loading */
|
|
int nf_ct_l3proto_try_module_get(unsigned short l3proto);
|
|
void nf_ct_l3proto_module_put(unsigned short l3proto);
|
|
|
|
/*
|
|
* Allocate a hashtable of hlist_head (if nulls == 0),
|
|
* or hlist_nulls_head (if nulls == 1)
|
|
*/
|
|
void *nf_ct_alloc_hashtable(unsigned int *sizep, int nulls);
|
|
|
|
void nf_ct_free_hashtable(void *hash, unsigned int size);
|
|
|
|
struct nf_conntrack_tuple_hash *
|
|
__nf_conntrack_find(struct net *net, u16 zone,
|
|
const struct nf_conntrack_tuple *tuple);
|
|
|
|
int nf_conntrack_hash_check_insert(struct nf_conn *ct);
|
|
bool nf_ct_delete(struct nf_conn *ct, u32 pid, int report);
|
|
|
|
bool nf_ct_get_tuplepr(const struct sk_buff *skb, unsigned int nhoff,
|
|
u_int16_t l3num, struct nf_conntrack_tuple *tuple);
|
|
bool nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse,
|
|
const struct nf_conntrack_tuple *orig);
|
|
|
|
void __nf_ct_refresh_acct(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
|
|
const struct sk_buff *skb,
|
|
unsigned long extra_jiffies, int do_acct);
|
|
|
|
/* Refresh conntrack for this many jiffies and do accounting */
|
|
static inline void nf_ct_refresh_acct(struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
const struct sk_buff *skb,
|
|
unsigned long extra_jiffies)
|
|
{
|
|
__nf_ct_refresh_acct(ct, ctinfo, skb, extra_jiffies, 1);
|
|
}
|
|
|
|
/* Refresh conntrack for this many jiffies */
|
|
static inline void nf_ct_refresh(struct nf_conn *ct,
|
|
const struct sk_buff *skb,
|
|
unsigned long extra_jiffies)
|
|
{
|
|
__nf_ct_refresh_acct(ct, 0, skb, extra_jiffies, 0);
|
|
}
|
|
|
|
bool __nf_ct_kill_acct(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
|
|
const struct sk_buff *skb, int do_acct);
|
|
|
|
/* kill conntrack and do accounting */
|
|
static inline bool nf_ct_kill_acct(struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
const struct sk_buff *skb)
|
|
{
|
|
return __nf_ct_kill_acct(ct, ctinfo, skb, 1);
|
|
}
|
|
|
|
/* kill conntrack without accounting */
|
|
static inline bool nf_ct_kill(struct nf_conn *ct)
|
|
{
|
|
return __nf_ct_kill_acct(ct, 0, NULL, 0);
|
|
}
|
|
|
|
/* These are for NAT. Icky. */
|
|
extern s32 (*nf_ct_nat_offset)(const struct nf_conn *ct,
|
|
enum ip_conntrack_dir dir,
|
|
u32 seq);
|
|
|
|
/* Fake conntrack entry for untracked connections */
|
|
DECLARE_PER_CPU(struct nf_conn, nf_conntrack_untracked);
|
|
static inline struct nf_conn *nf_ct_untracked_get(void)
|
|
{
|
|
return raw_cpu_ptr(&nf_conntrack_untracked);
|
|
}
|
|
void nf_ct_untracked_status_or(unsigned long bits);
|
|
|
|
/* Iterate over all conntracks: if iter returns true, it's deleted. */
|
|
void nf_ct_iterate_cleanup(struct net *net,
|
|
int (*iter)(struct nf_conn *i, void *data),
|
|
void *data, u32 portid, int report);
|
|
void nf_conntrack_free(struct nf_conn *ct);
|
|
struct nf_conn *nf_conntrack_alloc(struct net *net, u16 zone,
|
|
const struct nf_conntrack_tuple *orig,
|
|
const struct nf_conntrack_tuple *repl,
|
|
gfp_t gfp);
|
|
|
|
static inline int nf_ct_is_template(const struct nf_conn *ct)
|
|
{
|
|
return test_bit(IPS_TEMPLATE_BIT, &ct->status);
|
|
}
|
|
|
|
/* It's confirmed if it is, or has been in the hash table. */
|
|
static inline int nf_ct_is_confirmed(struct nf_conn *ct)
|
|
{
|
|
return test_bit(IPS_CONFIRMED_BIT, &ct->status);
|
|
}
|
|
|
|
static inline int nf_ct_is_dying(struct nf_conn *ct)
|
|
{
|
|
return test_bit(IPS_DYING_BIT, &ct->status);
|
|
}
|
|
|
|
static inline int nf_ct_is_untracked(const struct nf_conn *ct)
|
|
{
|
|
return test_bit(IPS_UNTRACKED_BIT, &ct->status);
|
|
}
|
|
|
|
/* Packet is received from loopback */
|
|
static inline bool nf_is_loopback_packet(const struct sk_buff *skb)
|
|
{
|
|
return skb->dev && skb->skb_iif && skb->dev->flags & IFF_LOOPBACK;
|
|
}
|
|
|
|
struct kernel_param;
|
|
|
|
int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp);
|
|
extern unsigned int nf_conntrack_htable_size;
|
|
extern unsigned int nf_conntrack_max;
|
|
extern unsigned int nf_conntrack_hash_rnd;
|
|
void init_nf_conntrack_hash_rnd(void);
|
|
|
|
void nf_conntrack_tmpl_insert(struct net *net, struct nf_conn *tmpl);
|
|
|
|
#define NF_CT_STAT_INC(net, count) __this_cpu_inc((net)->ct.stat->count)
|
|
#define NF_CT_STAT_INC_ATOMIC(net, count) this_cpu_inc((net)->ct.stat->count)
|
|
|
|
#define MODULE_ALIAS_NFCT_HELPER(helper) \
|
|
MODULE_ALIAS("nfct-helper-" helper)
|
|
|
|
#endif /* _NF_CONNTRACK_H */
|